Radiodial



May 24. 1927.

|.. E. SHAW RADIODIKL Filed April :50. 1925 Ira/Enron L outs Shaw BY Q/M TTORNEY Patented May 24,

' 'iionx's npsniwgor nnsT- o3AnGE',; NEWJERSEK;

f Ap ilication en ineer 30, 1525'.

Tlieinvention relates .to a one: piece mold- 7 ecl dial knob of theytype'cornmonly elnployecl sensitivecontro1'thanhas been-possible. here,

rheastats, and the like.

on electric, instruments for nanually 'aolustmg 'var ometers, .var1able Icondensers,

; Suclrplials are corninonly, formecl with a centrahlznoh portion usually knurled-for digital manipulation and which k TLOb,pOI-j tion 7 merges 7 into an .7 outwardly I extending flange portion proyidecl W th .afsem c rcular. line iof graduat onszancl w th correspon chn g numeral designations}; F

The present lis closure distinguishes ever known forms of such clia'ls iril that "the'cli ameter of the manipulating knob portion is" made quite large compared to the oven diameter of the un t soc-as ,t-ofeature amore to fore W itli the relatively isni'allfl size knob portion. ln holloiy 'dials oft thetype-undQr -clisc ussion. it has been regarded. "as necessary 7 to ,proyicle .rei'nfoifcing iweb m 61. the! usuaLcentraHypositioned mountingfhubfand posed to, mount certain; c' the annular space proyicled within the, knob of reinforcement c'ouldgfnothelusedie the sidejw alliof thefijknohfportion; even in cases here th e internal" d i an;left erofthe knob was less than the unusually lar'ge' sl z e herein featured. In av new zformef VBI'nlC/I condenser {invented} by capplicantQit Iis pro;

portion and, there-fore,- the usualsfpifcler invention is to y H the: lmurle'cl hollow" knob portion of; wh ch could be made 'o'fl unusuallylargeicldiineni sions ';,1Which would be th-e6 "of; internal v ire- 1 inforcelnent and other projections entencling into the annular space between thelinb andi" the outlining wall of ltheknob ,"antlv which' a tjthe sa me tilne coulolab e inade o'f theusual nioldable inateria'l iththerna r art ex; tremely thin incross, section and whicli'at the same time would be'of sufficient" rigidity t Withstand-the to Which such-clials are subjected.

3roacllythese objects are attained .by molding the dialknob Withthe desired large size and hollow configurationprovided care be exercised that the major part, of the molded structure be of uniform thickness and that the periphery adjacent itsextreme edn'e be sli 'htly thickened to provide an out "3 h V V lining relnforcernent, i V. V i

AnOtherOb ect' of the 1nvent-1on and fea-.

- turing economy in manufacturing. cost, is

'nainesifor con'venienceflof expression 'but,

they r v-i 1 n 1ed b a g rid; i their amm s m a -p nts a he at Walt Iorin Accord ngly, the pi ima y 5 1 1 669 O th I "provide arnolded Ilia-l; k ob, p

jiseirial nb, 2693i;

thef proli iclin gi of a'fm etaliinsert' j sleei e/in the' 'central and f which sleeye is secu'retl 'inpos'itionva's' an incident ofithe. mold 111g" process in forming the article.

of a screw for securing thel rnolclecl article toasts mounting. shaft, angl.. whijch screw is niou'ntecl afmolcled part ofthelhuh in 7' i order fa ta guidi g dfihc Screw 'in tsj i an hji iis o ii iee i g' he m n ng shaft or rod.'

. Variousotherohjects'iancl the invention will be in: part gohyious from anins pection of the} accompanying drawings part jvill' he :Irioiie ,fu llyl isetgfoi'tli 1n "the following "particular (lescripti onfof,

one-form ofclv-i'ce embodying my invention,

an cl'the invention-also consists in certain new claimed-,jj a J; V 111 accompanyin dr aWiri q Flgure ls-iis anew 1n. axial through a preferregl'l'enihcclimenti 0f the inrosssectionw gure', 2 is pa vie w in rear "elevation looking q I qlhdescriptionancl ing the v din" gaiad iigg igi be r one iiece molded constructiongof bakelite orf 'otherinae tei lal'usuallyuuseclin such constructions and" comprises. a substantially flat "irusto conical hollolW knoh portion 10, having "an 'QlQSGQl-j' afronta'vall -ll 'flojjf; slightly conyexecl forr n.='

Afiflange portioni12 extends outwardly and Y if v ' 'The, front and rear faces'13' and 14 of meter, Of knob ,ja'ortionf 1ntli the lniohl'por; tilvelycsinalljviglth, comthis "flange extend parallelto each other and V perpendicular-to the axis 'ofrotation 10f the V v disk indicatedby the lines 0a-b in Figure lfThe front face 13 of'jthis flange is par 105 .ticularly cle'sign'ecl'to-contain the graduation numerals, or other characters intended ,to v

:be read froinithe front side ofthe clial.

TheH flangepOl tion '12 is outlined by a dialwrim 15 the rearface 16'0fWl1lCl1 extends "parallel 4 to i and is offset: slightly rearward'ly from there'ar face of flange portion 12.

i, "TheiinVention also features the providing The front face of the dial rim is beveled, as shown in'17, and meets the rear face 16 at a sharp edge 18. The radial width from the inner to the outer edge of the face-16 is materially greater than the thickness of the knob portion and of the flange portion" than the front face 17$ It is a feature of this disclosure that V the external diameter of the knob portion considered in the plane of the face 18 is greater than the radius, of the entire knob. In other Words, the knob has a diameter greater than onehalf of the diameter of the dial rim.

It is particularly noted that except for this dial rim the flange portion and .the knob portion are of substantially uniform thickness and" in actual practicethe' parts are made thinner, and therefore cheaper, than similar constructions now on the market.

.Projecting integrally from the center of the'wall 11 and extending into the hollow knob portion. is a substantially cylindrical hub 20 somewhat resembling conventional forms, and this part of the device also re sembles conventional forms in that an open end metal insert sleeve 21 is mounted' cen- 1' trally in the hub. The construction 'distinguishes from conventional forms in that the sleeve is reduced in external d ameter at its inner endto form a shoulder 22. The shoulder is locked by a ring 23 formed integral with the hub: during .theprocess of molding the article. The ringoverl'aps the shoulder and thus provides an interlocking means forsecuring the sleeve permanently in preset positionin the hub.

A molded projection 24 extends laterally from one side of the hub to form a screw post for receiving a set screw 28 extending therethrough perpendicular to the axis a- -b. The metal sleeve is provided with a tapped aperture 26 to receive the screw carriedfby the post. In the illustrated showing the post is also tapped after the molding process to receive the screw but it is optional to the screw head through whether the screw engages either oi both the sleeve and molded post. Access is provided opening 27 in theside of the knob portion.

In the illustrated showing the side of the hub portion is roughened or knurled to facilitate engagement therewith by the oper-- ato'rs fingers and this'roughening extends not only along the side of the knob portion,

but also over a projecting rib "28' outlining the convexed wall 11 so asto provide an extensive surface for facilitating, engagement of' the device at its front side as well as'on the fr'usto-conical side "of the knob. i

f While I have shown 'and describedyandhave pointed out in the annexed claims, certa n novel features of my invention, it will be understood that various omisslons, substitutions 'and-changes in" the formand details of the device illustrated and in :its operation may be made by those skilled in the art Without departing from the. spirit of the invention. Y

tained mechanisms, said knob and said plate. being substantially of uniform thickness, bevel faced dl al 'rim outlining said flange.

portion,' an'd.said knob having a diameter .in the plane ofthetop of the'plate greater Having thus described my invention, 1'

than the maximum radius ofthepla'te and 1 rim, said: rim having al thickness greater than the thickness of the flangetonprovide astrengthened"peripheral edge to the flange.

2. A. molded dial knob including a 'frustoconieal hollow knob portion, a slightly convexed wall closing one end, a rim outlining the convexed wall, the side of said .kD'Ob'POl tionandsaidrim being knurled to provide roughened surface to the side and front of the knob.

Signed at New York, in the county of New, York and State. of New York, 29thday of April D. 1925. r

Louis SHA this 

